View Full Version : Help on amount of 3" internal discs needed

10-30-2013, 09:08 AM
I have a 2000 FLSTF that was converted to a Trike. The Engine was recently upgraded with Screaming Eagle Big Bore Kit, true duals (no crossover), and high performance air cleaner. I have installed 3" supertrapp internal disc exhaust and would like to know how many discs per muffler I should install with closed end caps and also how many discs per muffler with open end caps. Trike Kit makes the bike a bit heavier, so probably need more torque?? First time using this forum, appreciate you help. V/r Smokey.

10-30-2013, 12:44 PM
Try 10-12 discs with closed end cap, 4-6 discs with open.
The 3" "open" end cap is equivalent to 6-7 discs.

10-31-2013, 04:38 PM
Thank you for the info. Installed 4 discs per muffler with open end cap and the bike has great throttle response. One more question...Does the rear cylinder require more discs than the front or should both have same amount of discs? Thanks again for your help. V/r Smokey.

11-01-2013, 06:45 AM
The same amount should be good.